Merge polly.local:/tmp/22129/bug22129/my50-bug22129

into  polly.local:/home/kaa/src/maint/m50-maint--07OGt

mysql-test/r/type_float.result

@@ -262,6 +262,13 @@ desc t3;
 Field	Type	Null	Key	Default	Extra
 a	decimal(21,2)	NO		0.00	
 drop table t1,t2,t3;
+select 1e-308, 1.00000001e-300, 100000000e-300;
+1e-308	1.00000001e-300	100000000e-300
+0	1.00000001e-300	1e-292
+select 10e307;
+10e307
+1e+308
+End of 4.1 tests
 create table t1 (s1 float(0,2));
 ERROR 42000: For float(M,D), double(M,D) or decimal(M,D), M must be >= D (column 's1').
 create table t1 (s1 float(1,2));

mysql-test/t/type_float.test

@@ -178,7 +178,16 @@ show warnings;
 desc t3;
 drop table t1,t2,t3;
 
-# End of 4.1 tests
+#
+# Bug #22129: A small double precision number becomes zero
+#
+# check if underflows are detected correctly
+select 1e-308, 1.00000001e-300, 100000000e-300;
+
+# check if overflows are detected correctly
+select 10e307;
+
+--echo End of 4.1 tests
 
 #
 # bug #12694 (float(m,d) specifications)